Malicious PDF — malware analysis report

Static analysis result for SHA-256 1544b79814ac672c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 22:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c17e4da5726464c21521b1bff2cf7982 SHA-1: d8c93cda552be90e39b3f2072faf7f388f3a2ebf SHA-256: 1544b79814ac672c35ae92e50355c37b8b9db0ab61ed7999391fca90340a3d47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bangtaisay.com/uploads/userfiles/file/tirekajegubawuli.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/3498591269.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/95501439747.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/24889096217.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/nuxavujigiri.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/20425045545.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3ac9b6e724c56565d27beb401f56eb5a/59167970133.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/17113096695.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jozip.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xusukogepewe.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/82194165118.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wakabufav.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/80781202316.pdfIn PDF document text
    • http://methese.com/upload/files/lobafajurulufekalupa.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fegilo.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/nipukeronubitusaw.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/ninokukusekuxexexudafox.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/66087418499.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudidogovabemij.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/6248147178.pdfIn PDF document text
    • https://labelmarket.eu/data/file/15782250086.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/54543058697.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971681a785---59863057480.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/67165527164.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/490c38fe99fed0406850677f7d5d6b89/79283940976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+apk+player+for+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 17876 bytes
SHA-256: 6ba6d497b04134a3bb5c95f85ed18f60eb99c1073c8e25c2632a25fb0b53e4dc
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 10536 bytes
SHA-256: 46f22455539688bdb4026c9f3602077233e1fa0af83782579eec1da494d7d5f0
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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